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Register a new userStudying of effect of different profile types of pipes on pressure values resulted from water hammer
دراسة تأثير أشكال المقاطع الطولية المختلفة للأنبوب على قيم الضغط الناتجة عن الصدمة المائية
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معلا معلا( باحث )
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تم اجراء دراسة وصفية تحليلية لتفسير كيفية تأثير المقطع الطولي للأنبوب على قيم الضغط للصدمة المائية الناتجة عن توقف المضخات , والتي ينتج عنها موجة ضغط منخفض غالبا ما تؤدي الى حصول التكهف في الشبكة,وقد تبين من الدراسة التحليلية لعدة مقاطع ومقارنة النتائج أن تأثير المقطع الطولي مرتبط بظاهرة التكهف,وإن شكل المفطع الطولي ومنسوب خط الضغط الحاصل بعد توقف المضخات يحدد نوعية التكهف المتشكل والمنطقة التي يحدث بها وقيم الضغط الناتجة عنه والتي تختلف من مقطع لآخر,كما أنه عند عدم احتواء المقطع على ذروة , أو احتوى على ذروة أو أكثر منسوبها تحت منسوب خط الضغط , يحدث التكهف المنتشر وتزداد قوى الضغط الناتجة عنه كلما زاد طول الأنبوب المعرض للتكهف,أما في حالة وجود ذروة أو أكثر فتأثير الذروة مرتبط بعدة عوامل: 1- كلما زاد ارتفاع الذروة عن خط الضغط,تزداد إمكانية حصول انفصال في بنية السائل,وتزداد قوى الضغط الناتجة عن الصدمة, ولا تظاثير للذروة في حال وقوعها تحت خط الضغط. 2- تزداد قوى الضغط الناتجة عن الصدمة كلما كانت الذروة أقرب للمضخات.
Analysis study was done to explain the effect of the longitudinal section on the values of pressure of the water hammer resulting from the trip of pumps, which results a low pressure wave often lead to get cavitation, has been shown from the analytical study of several profiles and compare the results, that the shape of the profile and the level of the pressure line after the stopping of pumps determines the type of cavitation formed , the region in which it occurs and the pressure values resulting from it, when the profile doesn’t contain bends or the bends are below the level of line pressure a distributed cavitation is occurred, In the case of the presence of high points , the effect of the bend is linked to several factors: 1 - the greater the height of the bend above line pressure increases the possibility for column separation and increases the pressure forces. 2 –the pressure forces increase whenever the bend closer to the pumps.
References used
Bergant, A, and Simpson, A.R. (1997). Development of a generalized set of pipeline water hammer and column separation equations., University of Adelaide, Adelaide, Australia,350P
GARR M. JONES , 2006 - pumping station design , Butterworth-heineman ,USA ,640P
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